InChI=1S/C19H18O5S/c20-18(13-10-16-6-2-1-3-7-16)9-5-4-8-17-11-14-19(15-12-17)24-25(21,22)23/h1-9,11-12,14-15H,10,13H2,(H,21,22,23)/b8-4+,9-5?